Reland "client: enable isolated everywhere again"
Reland "client: enable isolated everywhere again"

This is a reland of eb5723dde683037607f9c1fcc99e6142e8db3198

Original change's description:
> client: enable isolated everywhere again
>
> This is to take heap profiling in failing tasks.
>
> Bug: 1045281
> Change-Id: Ia0a021bf6d941d6a32b28c33bb875e33c41b5a7e
> Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/2217985
> Commit-Queue: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>
> Auto-Submit: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
> Reviewed-by: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>

Bug: 1045281
Change-Id: Ifd6baee4a3b7cb219351f704bf0ee3f0e013f8b8
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/2226247
Commit-Queue: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Commit-Queue: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>
Auto-Submit: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Reviewed-by: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>

luci/luci-py,luci/luci-py,luci/luci-py,luci/luci-py